ConstructionEnabledAttribute Class

 

Enables COM+ object construction support. This class cannot be inherited.

Namespace:   System.EnterpriseServices
Assembly:  System.EnterpriseServices (in System.EnterpriseServices.dll)

System.Object
  System.Attribute
    System.EnterpriseServices.ConstructionEnabledAttribute

<AttributeUsageAttribute(AttributeTargets.Class, Inherited := True)>
<ComVisibleAttribute(False)>
Public NotInheritable Class ConstructionEnabledAttribute
	Inherits Attribute

NameDescription
System_CAPS_pubmethodConstructionEnabledAttribute()

Initializes a new instance of the ConstructionEnabledAttribute class and initializes the default settings for Enabled and Default.

System_CAPS_pubmethodConstructionEnabledAttribute(Boolean)

Initializes a new instance of the ConstructionEnabledAttribute class, setting Enabled to the specified value.

NameDescription
System_CAPS_pubpropertyDefault

Gets or sets a default value for the constructor string.

System_CAPS_pubpropertyEnabled

Gets or sets a value indicating whether COM+ object construction support is enabled.

System_CAPS_pubpropertyTypeId

When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)

NameDescription
System_CAPS_pubmethodEquals(Object)

This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)

System_CAPS_pubmethodGetHashCode()

Returns the hash code for this instance.(Inherited from Attribute.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethodIsDefaultAttribute()

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)

System_CAPS_pubmethodMatch(Object)

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

NameDescription
System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfoCount(UInt32)

Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

For a list of initial property values for an instance of ConstructionEnabledAttribute, see the ConstructionEnabledAttribute constructor.

For more information about using attributes, see Extending Metadata Using Attributes.

The following code example demonstrates the use of this attribute to associate an object constructor string with a ServicedComponent class.

' Accept a constructor string.
<ConstructionEnabled()>  _
Public Class EmployeeInformation

    Inherits ServicedComponent

    ' The employee's user name and salary.
    Private accountName As String
    Private salary As Double = 0

    ' Get the employee's name. All users can call this method.
    Public Function GetName() As String 
        Return accountName

    End Function 'GetName

    ' Set the employee's salary. Only managers can do this.
    Public Sub SetSalary(ByVal ammount As Double) 
        If SecurityCallContext.CurrentCall.IsCallerInRole("Manager") Then
            salary = ammount
        Else
            Throw New UnauthorizedAccessException()
        End If

    End Sub 'SetSalary

    ' Get the employee's salary. Only the employee and managers can do this.
    Public Function GetSalary() As Double 
        If SecurityCallContext.CurrentCall.DirectCaller.AccountName = accountName OrElse SecurityCallContext.CurrentCall.IsCallerInRole("Manager") Then
            Return salary
        Else
            Throw New UnauthorizedAccessException()
        End If

    End Function 'GetSalary

    ' Use the constructor string.
    ' This method is called when the object is instantiated.
    Protected Overrides Sub Construct(ByVal constructorString As String) 
        accountName = constructorString

    End Sub 'Construct

End Class 'EmployeeInformation

.NET Framework
Available since 1.1

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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